Seam for sewing together and covering for knitted and woven fabrics



Jan. 4, 1927. G. HUBER SEAM FOR SEWING TOGETHER AND COVERING FOR KNITTED AND WOVEN FABRICS Original Filed Auggst 25, 1920 j 8 f2 d/ jazwm Patented Jan. 4, 1927.

UNITED STATES GUSTAV HUBER, or s'rurrenn r, GERMANY. SEAM FOR- SEWING roenrnnn Ann cove-ama- FOB xnrrrnn AND woven nannies.

Original application filed August 25, 1820. Serial No. 405,927, and in Germany March 24, 1919. Divided.

PATENT ofrrics.

and. this application filed March 27, 1922. Serial No. 547,093.

(GRANTED UNDER THE PRGVISIGNS OF THE ACT OF MARCH 3, 1921, 41 STAT. L, 1313.)

The object of the present invention is to produce in one operation an ordinary seam for uniting two pieces of fabricand an overseam for covering over the uniting seam.

To this end the united pieces of fabric are so bent over on both sides of the ordinary seam, that the needle for making the overseam can stitch through the edges of the bent over pieces of fabric above and below 1 the ordinary seam, a looper cooperating with the overseam needle in such a way the overseam thread is caught alternately above and below the ordinary seam whereby the latter is entirely covered. The ordinary seam uniting the two pieces of fabric. preferably consists of two chain stitches running closely side by side, but being offset relative to each other so as to impart to the seam greater extensibility. In this way a seam is produced in which the overseam contributes to hold the two pieces of fabric together and as the projecting edges of the united pieces of fabric can be closely trimmed, the overseam will lie flatly over the ordinary seam.

trated my invention by way of example,

Fig. 1 shows the new combined seam and overseam as seen from the back, Fig. 2 shows the combined seam from the front, Fig. 3 shows the two stitching operations; Fig. 4 shows the stitching together of two pieces of fabric; Fig. 5 is a view similar to Fig. i, in which no underthread is used for the uniting seam; Fig. 6 is a cross-section through the united pieces of fabricshowing the stitching of the seam by the overseam needle.

The ordinary seam for uniting the ieces of fabric consists of two chain stitches a and .7), running closely side by side, whereby the pieces of fabric 0 and d are united.

The two chain stitches a and b, as shown in Figs. 4 and 5, are in well-known manner relatively displaced so that by the two chain stitches aand b an extensible seam is produced.

The overseam, according to the present invention is produced by a single needle thread f and looper thread 6 which threads are laced over the seam 9 previously formed ii the chain stitches a and b.

The well-known ordinary seam aand b is produced by the two needles h and 2' a1- In the drawing, in which I have illusranged side by sidebut displaced relative to each other in the direction of feed,- each needle carrying its own thread but both cooperating with a common looper k.

Fig. 3 shows the position of the needles it and i and the looper 7c, in which the advancing looper is with its thread Z has engaged the two loops m and 11, of the ascending needles 71; and i, so as to throw said loops onto the looper thread'l after the needles it and 2' have ascended.

The overseam is produced by the overseam needle 0 and a looper p. For this purpose the sewed together pieces 0 and (Z are bent over on both sides of the seam g in the manner as shown in Fig. 6, so that the bent over edges can be stitched by the overseam needle 0. The overseam stitch may be a true blind stitch, or may pass beyond the bent over edges to form a through stitch which shows on the opposite side of the material, as indicated in Fig. 1; the thread enters and emerges from the same side of each piece of fabric to form either type of stitch.

For bending over the pieces of fabric 0 and (Z, a suitably shaped member 9 is provided acting as spreader. During the operation of the overseam needle 0 a suitably shaped ledge 1' presses the seam 9, after first the projecting edges of the two pieces of fabric have been trimmed by a trimming mechanism s (Fig. 3), against the feed mechanism a mounted in the spreader q.

The part t in Fig. 3 is the pressure foot for holding the work pieces 0 and d during the sewing operation.

The overseam needle 0 in performing its work may either pass through the extreme edges of the bent over portions of the united pieces of fabric 0 and d as is shown in Fig. 6, or the needle may pass through the said edges where they start to be formed depending on the position of the ledge 1' in the spreader g. In the first instance. the thread. of the overseam will be practically invisible on the back of the fabrics, whereas in the other instance, it will be slightly visible.

I claim as my invention:

1. A seam for covering raw abutting edges of two pieces of fabric which are joined by a line of stitching consisting of a series of thread loops, each thread loop entering and emerging from the same face of one of the pieces of fabric at one side of the abutting edges, and covering the raw edges and then entering and emerging from the same face of the other piece of fabric at the other side of the abutting edges, and means look ing said thread loops. I

2. The process of covering the abutting edges of two pieces of fabric which are joined by a line of stitching, comprising passing thread loops into and out of the same face of one of the pieces of fabric then covering the raw edges, then passing the loops into and-out of the same face of the other piece of fabric-,- andlocking the loops.

3. The method of producing a combined seam and oversearn in one operation which consists infirst uniting two pieces of fabric by a seam, then spreading the united pieces of fabric and forming bent edges thereof on both sides of said seam, and finally stitching through said bent over edges with a thread covering the first seam.

4.. The method of producing acombined seam and overseam in one operation which consists in first uniting two pieces of fabric 25 by a seam, then trimming the edges of the united pieces of fabric and spreading the same so as to form bent edges thereof on both sides of said seam, and finally stitching through said bent over edges with a 30 thread covering the said first seam.

In testimony whereof I afiix my signature.

GUSTAV HUBER. [1,. s] 

